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The '''Usurper''' is a pattern of tracked artillery vehicle used by the forces of [[Chaos]] (including the [[Infardi]]{{Fn|11a}} and the [[Blood Pact]]{{Fn|2}}) against [[Imperial]] forces in the [[Sabbat Worlds Crusade]].{{Fn|11a}}{{Fn|2}}

Produced by the [[Forge World]] of [[Urdesh]],{{Fn|4}} the Usurper is a relatively primitive vehicle sporting a crude copy of the [[Earthshaker (Cannon)|Earthshaker]] as its primary weapon,{{Fn|1a}} capable of blowing a ten-metre chunk out of a wall.{{Fn|11b}}

*{{Endn|1}}: [[Honour Guard (Novel)]] — [[The Saint (Omnibus)]], :**{{Endn|1a}}: Chapter Ten**{{Endn|1b}}: Chapter Fifteen